Vitek Fitness is the app I use to train my own clients. This page explains, in plain words, what the app stores about you, who can see it, and how you get rid of it. If anything here is unclear, write to me and I will explain it.
The short version
- The app is used by me and my coaching clients. It is not open to the public.
- There is no advertising in the app, no tracking, and nothing about you is sold or shared for marketing.
- Your progress photos are private. I see a photo only if you choose to share that photo with me.
- What the Health app gives us, your steps and the calories you burn, stays on your phone unless you choose to share it with me. Then one number a day is uploaded, and you can stop at any time.
- When you ask for a calorie estimate, the picture of the meal is sent away to be read and nothing else goes with it — not your name, not your account, none of the rest of your data.
- When you ask the app to read a recipe from a photo or a screenshot, only those pictures are sent to be read. Nothing about you goes with them.
- When you ask for a nutrient check, that week’s food log and your answers about coffee, supplements and medicines are sent to be read. Your name and your account do not go with it.
- You can delete your account, and everything personal in it, from inside the app at any time.
Who is responsible
Vitek Korinek, personal trainer. Oderstraße 20, 10247 Berlin, Germany. Email: info@vitekfitness.com. VAT identification number: DE405772163.
I am the person who decides what the app stores and why — in the wording of the GDPR, the controller.
What the app stores about you
- Your account and contact details: name, username, email address, phone number, postal address if you get invoices, date of birth and height.
- Your profile picture, if you upload one.
- Your training: the workouts you are given, every set, weight, repetition and note you record, the dates and times of your sessions, your personal records, and the activities you log yourself, like a run, a swim or a yoga class (what it was, the day, how long, how hard and how far).
- Your body measurements: body weight, tape measurements, the mobility checks I score with you, and the progress photos you take.
- Your food log: what you ate, your own recipes and meals, your favourites, and any photo you attach to a meal.
- Your nutrient checks: the answers you gave (coffee and tea, supplements, and medicines if you named any) and the report that came back.
- If you choose to share them: your steps and the calories you burned, one number a day.
- Your chat with me: the messages, pictures and videos we send each other, and the videos you film for a monthly test.
- Your appointments: sessions you book, move or cancel, and the availability you send me.
- Your invoices: name, address, amount, dates and payment status.
- Technical information needed to run the app: a notification token for your phone, the app version, and measurements of how long screens take to load.
Why the app is allowed to store it
Most of it is there because it is the coaching you asked for — a training app that forgets your training is of no use to anyone. That is the GDPR's "performance of a contract".
Health information — body weight, measurements, body photos, what you eat — is a special category under the GDPR and rests on your consent. You give that consent by entering it, and you can withdraw it by deleting the entry, or your whole account, at any time.
Medicines you name in a nutrient check, and the Health app numbers you share, are health information too and rest on your consent in the same way: you give it by answering or by switching sharing on, and you withdraw it by answering "Rather not say", switching sharing off, or deleting your account.
The chat is part of the coaching too. What you tell me there about your health, and the pictures and videos of you, rest on your consent: you give it by sending them. A message stays in the chat once it is sent, so to take one back, ask me and I will delete it, or delete your account.
Invoices are kept because German tax law requires it, not because I want them.
Who can see your data
You, and me as your trainer. Nobody else has an account in this app. That includes your chat, which only the two of us can read.
Your progress photos are the exception: they are private to you by default and I see one only after you switch sharing on for that specific photo. You can switch it off again.
Like any trainer, I keep my own coaching notes about our work together. They are not shown in your app, but they are part of your data — if you want to know what they say, ask me and I will tell you.
The Health app
If you allow it, the app reads your steps and the calories you burn from Apple Health on an iPhone, or from Health Connect on an Android phone, so they can be shown next to your training and your food.
That information stays on your phone unless you switch on "Share with Vitek". Then the app uploads one number a day for your steps and the calories you burned, so I can see them next to your food log and your nutrient check can compare what you ate with what you burned. Without a watch, the calories are the app’s own estimate from your weight, height, age, steps and training.
If you allow it, the app also reads the activities your watch saved in Apple Health in the last week (a run, a ride, a swim), so you can add them to your activities. One is only uploaded when you add it with a tap, or, if you switch on "Add activities from my watch automatically", when you open the app. Then the app sends what the activity was, the day, how long it took and how far, the same as one you type in yourself. Delete one and it is gone, and the app does not bring it back.
Switch sharing off and everything that was shared is deleted. Nothing else from Health is ever uploaded, nothing is used for advertising, and the app does not write anything into Health. You can take the reading permission back at any time, in the iPhone’s Settings or in Health Connect.
Camera and photos
The app asks for the camera and your photo library so you can take a progress photo, photograph a meal, photograph a recipe or pick screenshots of one, photograph the nutrition table on a food package, photograph an exercise, scan the barcode on a food package, pick a profile or cover picture, or send me a picture or video in the chat. It only ever opens them when you tap one of those buttons, and it does not look through your library.
When you film a video, the microphone records its sound too. The app uses the microphone for nothing else.
Progress photos are stored privately: they are not readable by a public link, and every photo can be deleted from the app, which removes the file itself and not just the entry.
The meal estimate
When you ask for a calorie estimate, the app sends the picture of the meal — and the note you typed with it, if you typed one — to Anthropic, the company whose AI reads it. A list of foods and numbers comes back. That is the whole exchange.
The picture is the only thing that travels. Your name, your account, your training, your measurements and everything else in the app stay where they are and are never part of it: what arrives at the other end is a photograph of food belonging to nobody in particular. Nothing there can reach back into the app or into your phone.
It is read by the machine, not by people, and it is not used to teach that machine anything. It is not saved on our side either — the only thing we record is that you used one of your estimates this week, so the weekly allowance works. On their side the picture is held briefly for automatic abuse checks and then deleted; it is never attached to you or kept as a collection of your meals.
The numbers that come back are an estimate, not a measurement. Treat them as a good guess.
Reading a recipe from a picture
When you ask the app to read a recipe from a photo or from screenshots, it sends those pictures (up to three) to Anthropic, the company whose AI reads them. The recipe written out comes back: its name, the ingredients and amounts, and the steps. The app then looks each ingredient up in its own food library and saves the recipe in your account, where you can change it or delete it.
Only the pictures travel. Your name, your account and the rest of your data are not part of it. They are read by the machine, not by people, and not used to teach that machine anything. The pictures are not saved on our side; the only thing recorded is that you used one of your recipe reads this month. On their side they are held briefly for automatic abuse checks and then deleted.
Pick pictures of the recipe only. Anything else in them, such as a name or a message on a screenshot, would be sent along with it.
Reading a food label from a photo
When a product's barcode is not in the food database, you can photograph the nutrition table on the back of the pack. The app sends that one photo to Anthropic, the company whose AI reads it, together with the product name the barcode found, if it found one. The numbers printed on the label come back and are filled into the form for a new food. Nothing is saved until you check them and press Save, and then only in your own account.
Only the photo and that product name travel. Your name, your account and the rest of your data are not part of it. The photo is read by the machine, not by people, and not used to teach that machine anything. It is not saved on our side; the only thing recorded is that you used one of your label reads this month. On their side it is held briefly for automatic abuse checks and then deleted.
The nutrient check
When you ask for a nutrient check, the app sends that week’s food log to Anthropic, the company whose AI reads it: what you ate and how much, your answers about coffee and tea, supplements and medicines, your sex, age and body weight, the targets I set for you, how many times you trained that week, and, if you share them, the calories you burned and your steps.
Your name, your email address and your account are not part of it. It is read by the machine, not by people, and it is not used to teach that machine anything. On their side it is held for a short time for automatic abuse checks and then deleted.
The report that comes back is saved in your account, where you and I can read it, and it is deleted with your account.
Medicines are optional. You can always answer "Rather not say", and then the check does not mention them at all. It never comments on a medicine itself, and it is not medical advice.
Food search
When you search for a food, what you typed is sent to public food databases — Open Food Facts, the USDA FoodData Central database, and Wikipedia — to find the item. Nothing that identifies you is sent with it.
The food names, nutrition figures and product photos you see come from those three databases, used with thanks under their open licences.
Your calendar and notifications
If you allow calendar access, the app writes your training sessions into your phone's own calendar and keeps them up to date when a session moves or is cancelled. Take the permission away and it stops.
If you also switch on "Show my appointments" on the availability screen, the app reads the appointments in the calendars you choose and shows them there, so you can see when you are free. They are only read on your phone: nothing from your calendar is sent to me or stored anywhere else. I only see the times you mark as free.
Notifications are used for session reminders, for telling you when a session is moved or cancelled, and for telling you when I write to you in the chat. Such a notification shows the start of the message, on your phone and on mine when you write to me, so those words pass through the delivery services listed below. You can turn notifications off in your phone's Settings, and choose the reminder time inside the app.
The companies that help run the app
The app cannot work without a few service providers. They act on my instructions and may not use your data for their own purposes:
- Supabase — the database, the file storage and the sign-in. Your data is stored on servers in Ireland, inside the EU.
- Anthropic: reads the meal pictures, the recipe pictures, the photos of food labels and the nutrient checks described above, and is given nothing else about you. Servers in the United States.
- Expo — delivers app updates and passes notifications on to Apple or, on an Android phone, to Google. United States.
- Apple — the App Store, TestFlight and the notification delivery to your iPhone.
- Google: on an Android phone only, delivers the notifications to your phone (Firebase Cloud Messaging). It receives a notification token for your phone and the text of the notification, nothing else. United States.
Where a provider is outside the EU, the transfer is covered by the European Commission's standard contractual clauses.
How long it is kept
As long as you have an account. If you stop training with me and want it gone, delete the account — you do not have to ask me.
When an account is deleted, everything personal goes: your body photos and the files behind them, your measurements and mobility checks, your food diary and nutrient checks, the Health app numbers you shared, your goals, your notes, your chat with me and the pictures and videos in it, your profile details and your login.
Your training records — the sets and weights themselves — are kept without your name attached, because they are also part of my own record of the work. They can no longer be traced back to you.
Invoices are kept for ten years. German tax law requires it and I have no choice about that.
Deleting your account
In the app: the Me tab, then Account, then "Delete my account". It asks you twice, and then it is done — the login is closed immediately and cannot be reopened.
If you would rather I did it, write to me and I will.
Your rights
You have the right to ask what is stored about you and to get a copy, to have wrong details corrected, to have your data deleted, to object to how it is used, and to withdraw a consent you gave earlier.
Write to info@vitekfitness.com and you will get an answer within a month.
If you think I have handled your data badly, you can complain to the Berlin data protection authority: Berliner Beauftragte für Datenschutz und Informationsfreiheit.
Security
Everything the app sends travels over an encrypted connection. Body photos, profile pictures and the pictures and videos in the chat are held in private storage that a link alone cannot open. The database checks, for every single request, that the person asking is allowed to see that particular row.
Children
The app is not intended for anyone under 16.
This is not medical advice
Vitek Fitness is a training and nutrition app, not a medical service. The calorie and nutrition numbers in it are estimates, not measurements. The training is coaching, not treatment. If you have a health condition, are injured, are pregnant, or are unsure whether an exercise is safe for you, ask a doctor first.
Changes to this page
If the app starts doing something new with your data, this page is updated first and the date at the top changes.
Contact
Vitek Korinek — Oderstraße 20, 10247 Berlin, Germany — info@vitekfitness.com — VAT ID DE405772163
Last updated 4 November 2026.